Remove link to Cloudflare cert for Pages

Also copyedit docs about manual SSL cert with Cloudflare certs.

changelogs/unreleased/231584-remove-link-to-cloudflare-cert-docs-from-gitlab-pages-docs.yml

+---
+title: Remove link to Cloudflare cert for Pages
+merge_request: 37876
+author: Takuya Noguchi
+type: other

doc/user/project/pages/custom_domains_ssl_tls_certification/index.md

 ---
-last_updated: 2019-07-04
+last_updated: 2020-07-25
 type: reference, howto
 disqus_identifier: 'https://docs.gitlab.com/ee/user/project/pages/getting_started_part_three.html'
 stage: Release
@@ -129,7 +129,7 @@ They require:
 | ------------------------------------------------- | ---------- | ---------------------- |
 | `example.com`                                     | A          | `35.185.44.232`        |
 | `_gitlab-pages-verification-code.example.com`     | TXT        | `gitlab-pages-verification-code=00112233445566778899aabbccddeeff` |
-|--------------------------------------------+--------------------------------------------|
+|---------------------------------------------------+------------+------------------------|
 | `www.example.com`                                 | CNAME      | `namespace.gitlab.io`  |
 | `_gitlab-pages-verification-code.www.example.com` | TXT        | `gitlab-pages-verification-code=00112233445566778899aabbccddeeff` |
 
@@ -236,7 +236,9 @@ To secure your custom domain with GitLab Pages you can opt by:
 - Manually adding SSL/TLS certificates to GitLab Pages websites
   by following the steps below.
 
-### Requirements
+### Manual addition of SSL/TLS certificates
+
+You can use any certificate satisfying the following requirements:
 
 - A GitLab Pages website up and running accessible via a custom domain.
 - **A PEM certificate**: it is the certificate generated by the CA,
@@ -250,7 +252,10 @@ To secure your custom domain with GitLab Pages you can opt by:
 - **A private key**, it's an encrypted key which validates
   your PEM against your domain.
 
-### Steps
+NOTE: **Note:**
+[Cloudflare certificates](https://about.gitlab.com/blog/2017/02/07/setting-up-gitlab-pages-with-cloudflare-certificates/), for example, meet these requirements.
+
+#### Steps
 
 - To add the certificate at the time you add a new domain, go to your
   project's **Settings > Pages > New Domain**, add the domain name and the certificate.

doc/user/project/pages/index.md

@@ -59,7 +59,6 @@ To update a GitLab Pages website:
 | [Explore GitLab Pages](introduction.md) | Requirements, technical aspects, specific GitLab CI/CD configuration options, Access Control, custom 404 pages, limitations, FAQ. |
 | [Custom domains and SSL/TLS Certificates](custom_domains_ssl_tls_certification/index.md) | Custom domains and subdomains, DNS records, and SSL/TLS certificates. |
 | [Let's Encrypt integration](custom_domains_ssl_tls_certification/lets_encrypt_integration.md) | Secure your Pages sites with Let's Encrypt certificates, which are automatically obtained and renewed by GitLab. |
-| [Cloudflare certificates](https://about.gitlab.com/blog/2017/02/07/setting-up-gitlab-pages-with-cloudflare-certificates/) | Secure your Pages site with Cloudflare certificates. |
 
 Learn more and see examples: